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    Thunderbolt IV ICM Testing

    Think I have read practically every post on the internet about testing the Thunderbolt IV ignition module but have not found a method for actually testing the functionality of the unit. I went through the troubleshooting flowchart for a no start condition and got to the bottom where it said...
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    QD-13 Restoration

    Re: QD-13 Restoration If that worked, this is a portion of the parts list for the QD-13. The item of interest is the 301893 which looks like a tube with a lengthwise slit in it. Haven't been able to find a picture of a real one and like i said, i only have the remnants of one in my motor.
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    QD-13 Restoration

    Restoring my 10hp QD-13 and upon disassembling the swivel bracket I discovered that the liner was shot. A previous "restorer" had shoved a piece of tin in to take up the slack! So, looking for a replacement part and all the usual sources are saying it not available. Johnson part #0301893...
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    QD-13 Compression

    Ran a compression test on my '52 10hp Johnson and only got 35lbs/cylinder. So ran a lead-down test and it only showed a 10% loss in both cylinders. Doesn't add up but then this is my first adventure with an old 2-cycle. Anyone have some wisdom to impart?
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    '51 Johnson Starting Procedures

    I inherited a '51-'52 Johnson 10 hp engine that I was having trouble starting so took to a shop and had it gone over. Guy worked it over and said it was good to go. But I still have a hard time getting it to start and stay running once it does start (dies when you put it in gear). I figure it...
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